155-167This paper aims to study the weldment of
duplex stainless steel (DSS) AISI 2205. Tungsten inert gas (TIG) welding is
performed with controlled welding parameters. The effect of cooling rate on
microstructural changes is analyzed by varying the heat input during welding. The
results show that high heat input and excessive nickel content in the filler
wire, leads to excessive formation of austenite phases in the fusion zone.
Lower heat input nucleates lesser amount of austenite phases and also very low
heat input causes lack of fusion in the weld joints. Microstructural variations
due to welding are assessed by conducting the micro hardness test, impact
toughness test and tensile test. To study the effect of shot peening, the
samples are prepared from the DSS welded plate. The chloride induced stress
corrosion cracking (SCC) test is conducted and the result shows a noticeable
improvement in the corrosion resistance of the weld zone due to shot peening. The
findings of this study can be used in marine applications.
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